[Bug c++/18610] bad error message

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18610

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-09-21 13:09:55 UTC ---
But I think it can be considered fixed for 4.7 by Nathan's excellent work in
giving reasons why candidate functions are not viable:

t.cc: In function 'int f()':
t.cc:17:9: error: no matching function for call to 'g(F<int>&)'
t.cc:17:9: note: candidate is:
t.cc:12:22: note: template<class T> F<typename Q<T>::t> g(const F<T>&)
t.cc:12:22: note:   template argument deduction/substitution failed:
t.cc: In substitution of 'template<class T> F<typename Q<T>::t> g(const F<T>&)
[with T = int]':
t.cc:17:9:   required from here
t.cc:12:22: error: invalid use of incomplete type 'struct Q<int>'
t.cc:2:8: error: declaration of 'struct Q<int>'